main()
{
    int p, q, r, s, count=0;
    printf("The 4 fractions which sum is equal 1 are:\n");
    for (p=2;p<5;p++)
      for (q=p;q<7;q++)
        for (r=q;r<13;r++)
          if (p*q*r-q*r-p*r-p*q != 0)
          {
            s=(p*q*r)/(p*q*r-q*r-p*r-p*q);
            if ( !((p*q*r)%(p*q*r-q*r-p*r-q*p)) && s>=r)
             printf("[%2d] 1/%d+1/%d+1/%d+1/%d=1\n",++count,p,q,r,s);
          }
}